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Adsorption of Arsenate (V) and Arsenite (III) on Goethite in the Presence and Absence of Dissolved Organic Carbon

^a Dep. of Plant and Soil Science, College of Agriculture and Natural Resources, Univ. of Delaware, Newark, DE 19717
^b Dep. of Crop and Soil Environmental Sciences, College of Agriculture and Life Sciences, Virginia Tech., Blacksburg, VA 24061
^c Dep. of Plants, Soils, and Biometeorology, College of Agric., Utah State Univ., Logan, UT 84322

View larger version (21K): [in a new window]   Fig. 1. Adsorption of arsenate [As (V)], arsenite [As (III)], humic acid (peat), fulvic acid, and citric acid on goethite. Goethite suspension concentration = 2.50 g L-1, As (V) = 1.0 mM, As (III) = 1.0 mM, dissolved organic C = 1.0 mM C, and background electrolyte = 0.01 M NaNO3.

View larger version (19K): [in a new window]   Fig. 2. Arsenate [As (V)] adsorption on goethite in the presence and absence of (A) humic acid (peat), (B) fulvic acid, and (C) citric acid. Goethite suspension concentration = 2.50 g L-1, As (V) = 1.0 mM, dissolved organic carbon = 1.0 mM C, and background electrolyte = 0.01 M NaNO3.

View larger version (20K): [in a new window]   Fig. 3. Arsenite [As (III)] adsorption on goethite in the presence and absence of (A) humic acid (peat), (B) fulvic acid, and (C) citric acid. Goethite suspension concentration = 2.50 g L-1, As (III) = 1.0 mM, dissolved organic carbon = 1.0 mM C, and background electrolyte = 0.01 M NaNO3.

View larger version (21K): [in a new window]   Fig. 4. Adsorption of 1.0 mM C (A) humic acid, (B) fulvic acid, and (C) citric acid on goethite in the presence and absence of Arsenate [As (V)] or Arsenite [As (III)]. Goethite suspension concentration = 2.50 g L-1, As (V) = 1.0 mM, As (III) = 1.0 mM, and background electrolyte = 0.01 M NaNO3.

View larger version (24K): [in a new window]   Fig. 5. (A) Arsenate [As (V)] and (B) arsenite [As (III)] adsorption on goethite over time in the presence and absence of dissolved organic C (DOC). Goethite suspension concentration = 2.50 g L-1, As (V) = 1.0 mM, As (III) = 1.0 mM, DOC = 1.0 mM C, pHAs (V) = 6.50, pHAs (III) = 5.00, background electrolyte = 0.01 M NaNO3.